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ANDROID: sched/fair: add arch scaling function for max frequency capping

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To be able to scale the cpu capacity by this factor introduce a call to
the new arch scaling function arch_scale_max_freq_capacity() in
update_cpu_capacity() and provide a default implementation which returns
SCHED_CAPACITY_SCALE.

Another subsystem (e.g. cpufreq) or architectural or platform specific
code can overwrite this default implementation, exactly as for frequency
and cpu invariance. It has to be enabled by the arch by defining
arch_scale_max_freq_capacity to the actual implementation.

Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
( Fixed conflict with scaling against the PELT-based scale_rt_capacity )
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
Change-Id: I770a8b1f4f7340e9e314f71c64a765bf880f4b4d
This commit is contained in:
Dietmar Eggemann 2018-05-10 15:48:06 +01:00 committed by Quentin Perret
parent c06013206c
commit 6c401bf9b0
2 changed files with 17 additions and 4 deletions
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12
kernel/sched/fair.c
View File

@ -8357,10 +8357,9 @@ static inline int get_sd_load_idx(struct sched_domain *sd,
return load_idx;
}
static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
static unsigned long scale_rt_capacity(int cpu, unsigned long max)
{
struct rq *rq = cpu_rq(cpu);
unsigned long max = arch_scale_cpu_capacity(sd, cpu);
unsigned long used, free;
unsigned long irq;
@ -8382,10 +8381,15 @@ static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
static void update_cpu_capacity(struct sched_domain *sd, int cpu)
{
unsigned long capacity = scale_rt_capacity(sd, cpu);
unsigned long capacity = arch_scale_cpu_capacity(sd, cpu);
struct sched_group *sdg = sd->groups;
cpu_rq(cpu)->cpu_capacity_orig = arch_scale_cpu_capacity(sd, cpu);
cpu_rq(cpu)->cpu_capacity_orig = capacity;
capacity *= arch_scale_max_freq_capacity(sd, cpu);
capacity >>= SCHED_CAPACITY_SHIFT;
capacity = scale_rt_capacity(cpu, capacity);
if (!capacity)
capacity = 1;

9
kernel/sched/sched.h
View File

@ -1809,6 +1809,15 @@ unsigned long arch_scale_freq_capacity(int cpu)
}
#endif
#ifndef arch_scale_max_freq_capacity
struct sched_domain;
static __always_inline
unsigned long arch_scale_max_freq_capacity(struct sched_domain *sd, int cpu)
{
return SCHED_CAPACITY_SCALE;
}
#endif
struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
__acquires(rq->lock);